1 Corinthians 14:8-10

Amplified Bible, Classic Edition

⁸ And if the war bugle gives an uncertain (indistinct) call, who will prepare for battle?

⁹ Just so it is with you; if you in the [unknown] tongue speak words that are not intelligible, how will anyone understand what you are saying? For you will be talking into empty space!

¹⁰ There are, I suppose, all these many [to us unknown] tongues in the world [somewhere], and none is destitute of [its own power of] expression and meaning.